Rotary eraser



E. SHENKAN ROTARY ERASER April,23, 1929.

Filed Dec. 22, 1926 Patented pr. 23, 19729.

nMAnnnr. sieren-Kamer PITTSBURGH, :'ENNSYIQVANKIA ROTARY ERASER.

Application rfiled December 22, 1926. Serial No. 15654348.

'My Vinvention .relates animprovement in erasers, kand wh ile primarily yintemled for erasing incorrect single letters of typewritten words while the sheet oiA paper 1s 1n position in the typewriter, it will be obvious that the kdevice may be successfully employed for any other erasing purposes wherein it is found to be applicable.

Important objects of the invention are to provide an eraser of the character described.

kwhich is rotatably operable for facilitating the erasing of typewritten errors within the contines of a lii'nited space without erasing adjacent matter, which is simple in its con-k struction and arrangement, strong, durable and eliicient in its use, compact conveniently operable, attractive in appearance and comparatively inexpensiveto manufacture.

W ith the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the conn biuation ai details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention can be made within the scope of what is claimed without departing from the spirit of the invention. n n 1 in thedrawing wherein like numerals of reference designate corresponding` 'parts throughout the several views `Figure l is aside elevational View, partly in cross section, of a rotary eraser constructed in accordance with the invention.

.Figure 2 is a bottom plan view of 'the bottom cap. f f

Referring' in detail to the drawing 1 denotes an elongated, hollow, cylindrical barrel. The latter is provided with a cover cap 2 and a bottom cap il, both of which have a de- Atacliable threaded connection with resped tive en ds of the barrel 1.y The bottoni cap 3 is formed with an aperture 4t having four regularly arranged inwardly curved side walls 5, clearly shown in Figure 2.

A spiral screw spindle 6 extends through 'the bottom cap aperture l and isprovii'led with a. cylindrical shank 7 which is fixed to the upper end thereof.

shifted in either direction through the bot-` tom cap aperture Ll, by the rcciprocation'of the barrel 1, during the operation of the de-r formed with a :rangement of parts and in the The spindle 6 is preti erably constructed from square stock whichl vice,'the contacting engagement ofthe aperture side walls with thespindle 6 will imf part a rotary movement to the latter in a manner well known in the art. f The 'spindle shank 7 is rotatably mounted in the barrel 1 and is longitudinally shiftable inthe latter. The top of the shank 7 is with a pocket 9 formed in the lower end of a longitudinally shiftable bearing slide 10 n'iounted in the rbarrel 1 above the shank 7. A bearing ball 11, facilitating the rotation of the spindle 6, is positioned in the barrel l, and seats in the pockets 8 and 9 intermediate oil the shank 7 and the bearing slide 10.

A spiral spring 12, having its upper end n, abutting against the cover ycap 2 and having its lower end attached to the bearing slide 10, is mounted in the upper end portion of thereof, by means of a clamping sleeve 17.

The kupperend of the latter threadably engages the stem upper end letwhile the lower f end thereof is correspondingly tapered and engages the lower tapered end of the stem 13, for clamping the eraser element 16 in position. ,j The release of the clamping sleeve 17 permits of the adjustment or replacement of the eraser element 16 in the stem 13.

ln practice the operation of my improved eraser is as follows Normally the spindle 6 is maintained in the projecting position by the action of the spring' 12, as shown in Figure 1. The eraser element 16 is positioned to cover the surface to be erased. By forcing the barrel 1 downwardly, the spindle 6 and the associated eraser element 16, carried thereby, will ,be rotated to effect the erasing operation. The spindle 6 will now have entered the lower end portion of the barrel 1 and the spring 12 will be compressed. Upon releasing the pressure onthe barrel 1, the action of the compressed spring 1Q. will force the spindle 6 to the projecting position, meantime rotating the eraser element 16 for containing the erasing operation. The reciprocation of the barrel pocket 8, which corresponds erasing is completed.

spring 12, during the oieration of the de-H f vice will provide Suitable pressure for eij'i-v l is eontinuecL- in the manner Stated, until the Thev action of the aperture and immesse slii'fiable in either direction in tlie latter to impart rotary movement to said spindle7 e bearing; slide mounted in said'barrel, a shank iixed to the inner end of said spindle and disposed in said barrel, e. bearing ball disposed between lie edjficent ends of said slide and Seid shank, :L spring mounted in said barrel and engaging said bearing Slide for normally projeeing seidepindle from seid barrel, and an erasing element adjustably connected to *die lower end of said spindle. v

In testimony whereof I :LHX my signature.

Y' -EMANIIEL SHENKAN. 

